fix: Previous and next buttons and added slide number for better navigation of the slides.

[Namokar05]

Fixed the loop after clicking on the next button at the end of the slides and added slide number for better navigation of the slides.

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[melvincwng]

LGTM!

[melvincwng]

@Namokar05

1. You may add yourself as a contributor at this particular page - https://yfosp.netlify.app/contributors (follow existing style and outline, just need to add yourself)
2. Update this README.md too, add yourself as contributor - https://github.com/yfosp/main-website/blob/main/CONTRIBUTORS.md
3. And if you haven't join YFOSP, join us now - follow the instructions here: https://github.com/yfosp/start-here

Open a new PR, and tag me so that I can review once you're done

Thanks for your PR 👏🏻